Training whilst injured

[PeteS]

Firstly, don't panic! The rot takes a lot longer to set in than you would think. Yes you may lose the top end so to speak but the core fitness and stamina dissipates slowly. If you can cross train without aggravating the injury further, then do so- cycling, swimming etc, but also take the time to evaluate how you came to be injured in the first place and take steps to avoid it happening again. Above all rest although it's probably not what you want to hear!
I have struggled on and off for years with injury culminating last year in a nasty muscle tear which I persisted on running through. That was June and I have only just got back to running any kind of distance again.. With hindsight, I should have rested more and worked on the recovery sooner. I'm sure I would have been back earlier if I had done so.
Good luck - hope you're on the mend soon